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Tobacco aphid Myzus persicae (Sulzer), also known as the green peach aphid, is an important agricultural pests. In this study, fenvalerate, omethoate, methomyl, and imidacloprid representative pesticides on the nation's major tobacco producing area Aphidius virulence test; measured omethoate, methomyl and imidacloprid in different temperature conditions on the tobacco aphid virulence; tobacco aphid feeding on different host plants on the pesticide susceptibility differences and mechanism of the system; another using several inhibitors measured of fenvalerate, oxidation music fruit, imidacloprid, methomyl and four representative agents synergistic effect and mechanism of Exploration; determination of the specific activity of the resistant and susceptible populations of carboxylesterase and acetylcholinesterase, their mechanisms of resistance to further research; virulence determination of 11 pesticides screened efficient agent for prevention and control of tobacco aphid. The results showed that: 1, representative pesticides in four of the nation's major tobacco-growing areas Aphidius on resistance testing, relatively high resistance Pharmacy fenvalerate and omethoate. Fenvalerate, Bengbu, Anhui, Suzhou, Anhui, Fujian Sanming, Chuxiong, Dali, Yunnan, Changle, Shandong and Anhui Wuhu relatively high resistance, the LD50 were 1.6864 × 10 -1 -1 , 1.0809 × 10 -1 mg · head -1 , 9.444 × 10-2 ug of head - 1 , 8.0346 × 10-2μg · head -1 , 7.4698 × 10-2 ug of head -1 , 7.13 × 10-2 ug of head , -1 , 6.5146 × 10-2μg · head -1 , compared with the susceptible population. resistance ratio amounted to 56.4 times and 36.15 times, 31.56 times, 26.87 times, 24.98 times, 23.85 times and 21.79 times. Omethoate, Wuhu, Anhui, Shandong Changle, Sanming, Fujian and Yunnan Chuxiong relatively high resistance, its the LD 50 , respectively, 1.95578 ??× 10 -1 μg head -1 , 1.04 × 10 -1 microg head -1 , 9.446 × 10 2 ug of head -1 < / sup>, 6.3724 × 10-2μg · head -1 , compared with the susceptible population, the resistance ratio of 30.75 times, 16.35 times, 14.85 times and 10.02 times. Smoke tobacco aphid fenvalerate and omethoate higher levels of resistance. The methomyl Suzhou, Anhui, Yunnan Chuxiong, Dali, Yunnan and Anhui Wuhu LD50 of tobacco aphid populations were 2.03 × 10-3μg · head the -1 1.047 × 10-3μg · head - 1 , 7.3 × 10-4μg · the head -1 6.2 × 10 4 ug head -1 resistance ratio, respectively, compared with the susceptible population, up to 7.07 times, 6.00 times, 5.21 times and 5.00 times. Imidacloprid Sanming, Fujian, Anhui Bengbu, Longquan, Fujian, Heilongjiang Bin County and LD50 of Wuhu, Anhui tobacco aphid populations were 2.03 × 10-3μg · the head -1 , 1.047 × 10-3μg head -1 , 7.3 × 10-4μg · head -1 , 6.2 × 10-4μg · head
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